Blackberry-Maple Cobbler

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Unsalted butter, for the baking dish

6 cups blackberries

1/4 cup sugar

1/4 cup pure maple syrup

1 teaspoon pure vanilla extract

2 to 3 tablespoons all-purpose flour

For the topping:

1 1/3 cups all-purpose flour

1/3 cup sugar, plus more for sprinkling

2 1/4 teaspoons baking powder

1/2 teaspoon salt

6 tablespoons unsalted butter, at room temperature

1 large egg

1/2 cup buttermilk